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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2017 | May 31, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-vested shares (in shares) |  |  | 424,341 | 501,770 | 424,341 | 501,770 | 422,928 | 319,058
Shares granted (in shares) |  |  |  |  | 206,597 | 332,921 |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 89,629 |  |  |  |  |  |
Fair value of shares granted |  | $ 0.4 |  |  |  |  |  |
Fair value, expected term |  | 3 years |  |  |  |  |  |
Fair value, expected term for volatility rate |  | 3 years |  |  |  |  |  |
Fair value, expected term for risk free interest rate |  | 3 years |  |  |  |  |  |
Fair value, expected term for dividend rate |  | 3 years |  |  |  |  |  |
Award vesting period | 3 years | 3 years |  |  |  |  |  |
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-vested shares (in shares) |  |  | 217,163 |  | 217,163 |  |  |
Share-based compensation expense |  |  | $ 0.3 | $ 0.4 | $ 0.6 | $ 0.7 |  |
Unrecognized compensation cost |  |  | $ 2.1 | $ 2.7 | $ 2.1 | 2.7 |  |
Unrecognized compensation cost, period for recognition |  |  |  |  | 2 years 20 days |  |  |
Fair value of vested shares |  |  |  |  | $ 1.1 | $ 1.0 |  |
Requisite service period |  |  |  |  | 3 years |  |  |
2017 Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) |  |  | 5,570,000 |  | 5,570,000 |  |  |
Shares available for grant (in shares) |  |  | 4,237,065 |  | 4,237,065 |  |  |
2017 Incentive Plan | Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 131,975 |  |  |
2017 Incentive Plan | Employee |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 209,264 |  |  |
2017 Incentive Plan | Performance Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) | 653,365 |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  | 991,696 |  | 991,696 |  |  |
Share-based compensation expense |  |  | $ 0.2 |  | $ 0.2 |  |  |
Unrecognized compensation cost |  |  | $ 2.4 |  | $ 2.4 |  |  |
Fair value of shares granted | $ 2.7 |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR performance Is Less Than The Thirtieth Percentile |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage | 0.00% |  |  |  |  |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR Performance Is Equal To The Fiftieth Percentile |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage | 100.00% |  |  |  |  |  |  |
2017 Incentive Plan | Performance Share Awards | Board of Directors Chairman |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value, expected term | 3 years |  |  |  |  |  |  |
Fair value, expected term for volatility rate | 3 years |  |  |  |  |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Non-vested shares (in shares) |  |  | 207,178 |  | 207,178 |  |  |

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